Which of the following bacterial arrangements is the result of snapping division?
A. tetrads
B. palisades
C. strepto-
D. sarcinae
E. staphylo-
Answer: B
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Which of the following is not a true statement about receptors that are localized to the nucleus?
A. They were synthesized in the cytosol. B. They carry a nuclear-localization signal. C. They bind polar ligands. D. They moved through a nuclear pore.
Hemophilia A is an X-linked recessive genetic condition. In humans it is due to a mutation in the F8 gene, which encodes a protein called coagulation factor VII. Coagulation factors are proteins important in blood clotting. Individuals with hemophilia, when injured, bleed longer than a normal, healthy individual; the inability to normally clot blood can be life threatening. Hemophilia is much more common in males than in females. Which of the following does NOT explain why this is so?
A. A female with one defective allele makes enough normal coagulation factor VII to clot blood and will not have hemophilia A. B. Females have to receive a defective allele from both their mother and their father to get hemophilia A. C. Males are hemizygous for the F8 gene, so they will have hemophilia A if they have one defective allele. D. Males have to receive a defective allele only from their father to get hemophilia A.
An organism’s habitat __________
a. is unchanging b. includes both living and nonliving components c. provides essential resources d. includes both living and nonliving components and provides essential resources
This animal has a pseudocoelom, is
unsegmented, a cuticle, and no circulatory system. This animal is ___.
a. a roundworm b. an earthworm c. a flatworm d. a leech e. more than one of these